Get started docs updates (docker#10218)

* Update Get started docs

* update part-1, add redirects

* draft updates to part 2 and 3

* tidy up the orchestration topics

* update examples, and other minor edits

* address Stefan's review comments

* moved orchestration to a new node

* fix Ben's review comments

* add email verification step

* Emphasize the CTA in part 3

Author: usha-mandya

_data/toc.yaml

@@ -27,14 +27,10 @@ guides:
     section:
     - title: "Part 1: Orientation and setup"
       path: /get-started/
-    - title: "Part 2: Containerizing an application"
+    - title: "Part 2: Build and run your image"
       path: /get-started/part2/
-    - title: "Part 3: Deploying to Kubernetes"
+    - title: "Part 3: Share images on Docker Hub"
       path: /get-started/part3/
-    - title: "Part 4: Deploying to Swarm"
-      path: /get-started/part4/
-    - title: "Part 5: Sharing images on Docker Hub"
-      path: /get-started/part5/
   - path: /get-started/resources/
     title: "Educational resources"
 - sectiontitle: Develop with Docker
@@ -129,6 +125,14 @@ guides:
         title: Use the VFS storage driver
 - sectiontitle: Run your app in production
   section:
+  - sectiontitle: Orchestration
+    section:
+    - title: "Overview"
+      path: /get-started/orchestration/
+    - title: "Deploy to Kubernetes"
+      path: /get-started/kube-deploy/
+    - title: "Deploy to Swarm"
+      path: /get-started/swarm-deploy/
   - sectiontitle: Configure all objects
     section:
     - path: /config/labels-custom-metadata/

develop/index.md

@@ -4,20 +4,23 @@ description: Overview of developer resources
 keywords: developer, developing, apps, api, sdk
 ---
 
-This page lists resources for application developers using Docker.
+This page contains a list of resources for application developers who would like to build new applications using Docker.
+
+## Prerequisites
+
+Work through the learning modules in [Get started](/get-started/index.md) to understand how to build an image and run it as a containerized application.
 
 ## Develop new apps on Docker
 
 If you're just getting started developing a brand new app on Docker, check out
 these resources to understand some of the most common patterns for getting the
 most benefits from Docker.
 
-- Learn to [build an image from a Dockerfile](/get-started/part2.md){: target="_blank" class="_"}
 - Use [multistage builds](/engine/userguide/eng-image/multistage-build.md){: target="_blank" class="_"} to keep your images lean
 - Manage application data using [volumes](/engine/admin/volumes/volumes.md) and [bind mounts](/engine/admin/volumes/bind-mounts.md){: target="_blank" class="_"}
-- [Scale your app](/get-started/part3.md){: target="_blank" class="_"} with kubernetes
-- [Scale your app](/get-started/part4.md){: target="_blank" class="_"} as a swarm service
-- General application development best practices
+- [Scale your app](/get-started/kube-deploy.md){: target="_blank" class="_"} with kubernetes
+- [Scale your app](/get-started/swarm-deploy.md){: target="_blank" class="_"} as a swarm service
+- [General application development best practices](/develop/dev-best-practices.md){: target="_blank" class="_"}
 
 ## Learn about language-specific app development with Docker